Android：如何只允许一键？

概述如何在Android上只允许一次触摸？我不想支持多点触控,如果我的一个手指已经触摸屏幕,我希望我的应用程序放弃其他触摸.就像在iOS上使用独家触控一样.另外,有没有办法设置允许的触摸次数？谢谢！编辑：最低目标API=8.解决方法:您必须跟踪第一次触摸的指针ID,并仅使用与该触摸相对应的

如何在Android上只允许一次触摸？我不想支持多点触控,如果我的一个手指已经触摸屏幕,我希望我的应用程序放弃其他触摸.就像在iOS上使用独家触控一样.

另外,有没有办法设置允许的触摸次数？

谢谢！

编辑：
最低目标API = 8.

解决方法:

您必须跟踪第一次触摸的指针ID,并仅使用与该触摸相对应的触摸事件.这是The official Android blog “Making Sense of Multitouch “的好例子

private static final int INVALID_POINTER_ID = -1;// The ‘active pointer’ is the one currently moving our object.private int mActivePointerID = INVALID_POINTER_ID;// Existing code ...@OverrIDepublic boolean ontouchEvent(MotionEvent ev) {    final int action = ev.getAction();    switch (action & MotionEvent.ACTION_MASK) {    case MotionEvent.ACTION_DOWN: {        final float x = ev.getX();        final float y = ev.getY();        mLasttouchX = x;        mLasttouchY = y;        // Save the ID of this pointer        mActivePointerID = ev.getPointerID(0);        break;    }    case MotionEvent.ACTION_MOVE: {        // Find the index of the active pointer and fetch its position        final int pointerIndex = ev.findPointerIndex(mActivePointerID);        final float x = ev.getX(pointerIndex);        final float y = ev.getY(pointerIndex);        final float dx = x - mLasttouchX;        final float dy = y - mLasttouchY;        mPosX += dx;        mPosY += dy;        mLasttouchX = x;        mLasttouchY = y;        invalIDate();        break;    }    case MotionEvent.ACTION_UP: {        mActivePointerID = INVALID_POINTER_ID;        break;    }    case MotionEvent.ACTION_CANCEL: {        mActivePointerID = INVALID_POINTER_ID;        break;    }    case MotionEvent.ACTION_POINTER_UP: {        // Extract the index of the pointer that left the touch sensor        final int pointerIndex = (action & MotionEvent.ACTION_POINTER_INDEX_MASK)                 >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;        final int pointerID = ev.getPointerID(pointerIndex);        if (pointerID == mActivePointerID) {            // This was our active pointer going up. Choose a new            // active pointer and adjust accordingly.            final int newPointerIndex = pointerIndex == 0 ? 1 : 0;            mLasttouchX = ev.getX(newPointerIndex);            mLasttouchY = ev.getY(newPointerIndex);            mActivePointerID = ev.getPointerID(newPointerIndex);        }        break;    }    }    return true;}

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